diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/support/AbstractFlashMapManager.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/support/AbstractFlashMapManager.java
index c859a2301a..f32e73806b 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/support/AbstractFlashMapManager.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/support/AbstractFlashMapManager.java
@@ -33,7 +33,6 @@ import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
 import org.springframework.web.servlet.FlashMap;
 import org.springframework.web.servlet.FlashMapManager;
-import org.springframework.web.util.UriComponents;
 import org.springframework.web.util.UrlPathHelper;
 
 
@@ -173,8 +172,7 @@ public abstract class AbstractFlashMapManager implements FlashMapManager {
 				return false;
 			}
 		}
-		UriComponents uriComponents = ServletUriComponentsBuilder.fromRequest(request).build();
-		MultiValueMap<String, String> actualParams = uriComponents.getQueryParams();
+		MultiValueMap<String, String> actualParams = getOriginatingRequestParams(request);
 		MultiValueMap<String, String> expectedParams = flashMap.getTargetRequestParams();
 		for (String expectedName : expectedParams.keySet()) {
 			List<String> actualValues = actualParams.get(expectedName);
@@ -190,6 +188,11 @@ public abstract class AbstractFlashMapManager implements FlashMapManager {
 		return true;
 	}
 
+	private MultiValueMap<String, String> getOriginatingRequestParams(HttpServletRequest request) {
+		String query = getUrlPathHelper().getOriginatingQueryString(request);
+		return ServletUriComponentsBuilder.fromPath("/").query(query).build().getQueryParams();
+	}
+
 	@Override
 	public final void saveOutputFlashMap(FlashMap flashMap, HttpServletRequest request, HttpServletResponse response) {
 		if (CollectionUtils.isEmpty(flashMap)) {
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/support/FlashMapManagerTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/support/FlashMapManagerTests.java
index 333a093bb6..b0bac5318b 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/support/FlashMapManagerTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/support/FlashMapManagerTests.java
@@ -21,6 +21,7 @@ import static org.junit.Assert.*;
 import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 
@@ -318,6 +319,25 @@ public class FlashMapManagerTests {
 		assertEquals("value", flashMap.get("key"));
 	}
 
+	@Test // SPR-15505
+	public void retrieveAndUpdateMatchByOriginatingPathAndQueryString() {
+		FlashMap flashMap = new FlashMap();
+		flashMap.put("key", "value");
+		flashMap.setTargetRequestPath("/accounts");
+		flashMap.addTargetRequestParam("a", "b");
+
+		this.flashMapManager.setFlashMaps(Collections.singletonList(flashMap));
+
+		this.request.setAttribute(WebUtils.FORWARD_REQUEST_URI_ATTRIBUTE, "/accounts");
+		this.request.setAttribute(WebUtils.FORWARD_QUERY_STRING_ATTRIBUTE, "a=b");
+		this.request.setRequestURI("/mvc/accounts");
+		this.request.setQueryString("x=y");
+		FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(this.request, this.response);
+
+		assertEquals(flashMap, inputFlashMap);
+		assertEquals("Input FlashMap should have been removed", 0, this.flashMapManager.getFlashMaps().size());
+	}
+
 
 	private static class TestFlashMapManager extends AbstractFlashMapManager {